The shakes are clumping, provided it allows the powder. In rice protein it is also difficult with this shaker, but it works. Classical protein shakes (whey) are easily clumping free. The 650ml sufficient thickness. Vs. benefit. larger shakers is the easier cleaning - especially if you have (yes, that should there be) no dishwasher. The rear flap can move independently from the closure. Where would we be the closure and the cover. This is completely sealed when zuschraubt him clever. Since nothing else or what drips. The two containers are practical and sufficient for another shake. With a simple movement of the hand they are bolted securely to the floor of the Shakers.
Full marks and strong buy recommendation